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Find the rate of energy flow through a copper block of cross-sectional area 15 cm^2 and length 8.0 cm when a temperature difference of 30 degree C is established across the block.
find the horizontal and the vertical components of its velocity, the magnitude of the velocity, and the angle made by the velocity vector with horizontal.
A 50-gram super ball traveling at 25m/s is bounced off a brick wall and rebounds at 22 m/s. A high speed camera records this event. If the ball is in contact with the wall for 3.5 ms, what is the av
A 55-kg jogger is heading 32° north of east at a speed of 3.0 m/s. Find the magnitude and direction of the sum of the momenta of the two joggers.
The backward direction relative to the centre of mass and the other has the velocity of 0.500c in the forward direction. what velocities will the observer find?
The atmosphere and cause them to glow. What is the radius of the circular orbit for (a) an electron with speed 3.0×106 and (b) a proton with speed 7.0×104 .
Consider 1500-Hz sound waves diffracted by a door that is 71 cm wide. What is the angle between the two first-order diffraction minima?
A 60-kg person drops from rest a distance of 1.20 m to a platform of negligible mass supported by a stiff spring. The platform drops 6 cm before the person comes to rest. What is the spring constan
A uniform electric field of magnitude 375 N/C pointing in the positive x-direction acts on an electron, whichis initially at rest. After the electron has moved 3.20 cm, what is (a) the work done by
Calculate the time required to bring all this water from 20°C to 100°C, ignoring any heat losses. (The specific heat of water is 4186 J/kg·K.)
What are the x and y components of the resultant force on the sled assuming the snow is frictionless? What is the magnitude of the acceleration of the sled?
After a tornado, a 0.55-g straw was found embedded 2.6 cm into the trunk of a tree. If the average force exerted on the straw by the tree was 70 N, what was the speed of the straw when it hit the tr
The ions then enter the bending region of a mass spectrometer where the magnetic field is 0.8900 T. Determine the spatial separation between the two isotopes after they have traveled through a half-
A circuit consists of a .025 F capacitor, in series with a 6 ohm resistor, in series with an open switch. How long does it take for the capacitor to lose 10% of its charge?
When you hold a convex (converging) lens in the sunlight over a piece of paper the paper ignites. (a) What is the likely focal length of the lens if it was held 15 cm above the paper?
Your cup of coffee is too hot to drink when served at 85.0..What is the mass of an ice cube, taken from a -15.0 freezer, that will cool your coffee to a pleasant 63.0?
The speed of bullet is measured to be 670m/s as the bullet emerges from a barrel of length 1.16m. Assuming constant acceleration, find the time that the bullet spends in the barrel after it is
An electric heater which draws 17.0 A on a 120-V line. How much power is dissipated in the cord? (answer needs to be W (power)).
A particle moves along the x axis under the influence of a variable force F(x) = 6.6x2 + 3.3x where the force is measured in Newtons and the distance in meters. What is the potential energy associat
A race car can be slowed with a constant acceleration of -14 m/s2. How many meters will it take to stop a car going twice as fast?
A pulley system has an efficiency of 87.5 percent. How much of the rope must be pulled in if a force of 648 N is is needed to lfit a 150 kg desk 2.46 m ?
What would be the tension in the string? Express your answer in newtons and in pounds. What gravitational force would each box of protons exert on the other box?
On a calm, bright day, you're scuba diving in a deep lake (n = 1.34), 6.30 m from your sailboat. When you are 2.70 m below the surface, the top of the sailboat mast appears to you to be in a directi
Compute the impulse that the body receives. How long does a force of 14.0N need to act in order to have the same impulse as before?
Then the bar is dropped. What is the terminal speed at which the bar falls? Assume the bar remains horizontal and in contact with the rods at all times.